Contains a source of live (viable), naturally occurring microorganisms. Directions: Beef - Newborns 5g at birth, 10g for Calves under 400 lbs., 15g for incoming Feedlot/Stockers over 400 lbs., 15g first day and last day of hospital therapy. Dairy - Calves 5g at birth, 15g for heifers over 400 lbs., 30g for cows at freshening